Battery management method, battery, flight control system and unmanned aerial vehicle

ABSTRACT

A method is provided for managing an unmanned aerial vehicle (UAV). The UAV includes a first cell unit and a second cell unit connected in parallel. The method includes: detecting, by a first control circuit, whether a failure occurs in the first cell unit; detecting, by a second control circuit, whether a failure occurs in the second cell unit; establishing a communication between the first control circuit and the second control circuit; and in response to detecting a signal indicating that a failure occurs in the first cell or the second cell from the first control circuit or the second control circuit, reducing an output power of a propulsion device of the UAV.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of application Ser. No. 15/858,869,filed Dec. 29, 2017, which is a continuation application ofInternational Application No. PCT/CN2015/082861, filed on Jun. 30, 2015,the entire contents of both of which are incorporated herein byreference.

TECHNICAL FIELD

The disclosure relates to battery management, and more particularly to abattery management method, a battery, a flight control system and anunmanned aerial vehicle.

BACKGROUND

With continuous development in electronics technology, unmanned aerialvehicles (UAVs) have been widely used in daily life. A battery is apower source for UAVs as it is lightweight, compact and stable indischarging. A battery of UAV comprises multiple cells. Anyover-voltage, under-voltage, over-current or over-temperature in one ormore of the cells can damage a composition material of the cell or evenlead to an explosion of the battery.

A battery management system (BMS) is provided to ensure a safe operationof the battery. The BMS can collect information of cells in the batteryincluding a voltage, a current or a temperature. The BMS can beconfigured to disconnect an electrical connection between the batteryand an external device using a protection circuit board if a failuresuch as an over-current or an over-temperature is detected in thebattery. An operation of the battery can be immediately terminated toprevent an over-voltage, an under-voltage, an overcurrent, ashort-circuit or an over-temperature, thereby ensuring a safety of thebattery.

In conventional technologies, a UAV carries only one battery in view ofa limited payload capacity, and that one battery may account for half oreven two thirds of the payload capacity. A power circuit of the UAV maybe switched off upon a failure in the battery. As a result, the UAV maycrash due to a loss of power in flight, leading to a safety risk.

A UAV may carry multiple batteries as backup batteries to extend aflight range. A backup battery can be used to power the UAV if a primarybattery fails, such that a crash of UAV due to a loss of power can beprevented. However, a payload capacity of the UAV may be reduced asmultiple batteries are carried onboard the UAV.

SUMMARY

The present disclosure provides a battery management method, a battery,a flight control system and an unmanned aerial vehicle to improve asafety of the unmanned aerial vehicle without reducing a payloadcapacity.

In accordance with the disclosure, there is provided a battery includinga first cell unit, a first control circuit electrically connected withthe first cell unit, a second cell unit connected with the first cellunit in parallel, and a second control circuit electrically connectedwith the second cell unit. The first control circuit is configured todisconnect an electrical connection between the first cell unit and apower output terminal of the first control circuit in response to afailure of the first cell unit. The second control circuit is configuredto disconnect an electrical connection between the second cell unit anda power output terminal of the second control circuit in response to afailure of the second cell unit.

Also in accordance with the disclosure, there is provided a method formanaging a battery including a first cell unit and a second cell unitconnected in parallel. The method includes detecting whether the firstcell unit or the second cell unit fails, directing the first cell unitto terminate discharging or charging in response to a failure of thefirst cell unit, and directing the second cell unit to terminatedischarging or charging in response to a failure of the second cellunit.

Also in accordance with the disclosure, there is provided an unmannedaerial vehicle including a propulsion device configured to provide apropulsion and a battery configured to provide an electric power to thepropulsion device. The battery includes a first cell unit, a firstcontrol circuit electrically connected with the first cell unit, asecond cell unit connected with the first cell unit in parallel, and asecond control circuit electrically connected with the second cell unit.The first control circuit is configured to disconnect an electricalconnection between the first cell unit and a power output terminal ofthe first control circuit in response to a failure of the first cellunit. The second control circuit is configured to disconnect anelectrical connection between the second cell unit and a power outputterminal of the second control circuit in response to a failure of thesecond cell unit.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a conventional unmanned aerial vehicle(UAV);

FIG. 2 is a schematic diagram of a battery in accordance with anembodiment of the disclosure;

FIG. 3 is another schematic diagram of a battery in accordance with anembodiment of the disclosure;

FIG. 4 is a schematic diagram of a flight control system in accordancewith an embodiment of the disclosure;

FIG. 5 is a flowchart of a battery management method in accordance withan embodiment of the disclosure;

FIG. 6 is another flowchart of a battery management method in accordancewith an embodiment of the disclosure;

FIG. 7 is a flowchart of a flight control method in accordance with anembodiment of the disclosure;

FIG. 8 is another flowchart of a flight control method in accordancewith an embodiment of the disclosure;

FIG. 9 is a schematic diagram of an unmanned aerial vehicle (UAV) inaccordance with an embodiment of the disclosure;

FIG. 10 is a schematic diagram of a kit for assembling a UAV inaccordance with an embodiment of the disclosure;

FIG. 11 is another schematic diagram of a UAV in accordance with anembodiment of the disclosure;

FIG. 12 is another schematic diagram of a kit for assembling a UAV inaccordance with an embodiment of the disclosure;

FIG. 13 is a flowchart of a fault handling method of a UAV in accordancewith an embodiment of the disclosure; and

FIG. 14 is a schematic diagram of a UAV in accordance with an embodimentof the disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Technical solutions of the present disclosure will be described withreference to the drawings. It will be appreciated that embodiments asdescribed in the disclosure are some rather than all of the embodimentsof the present disclosure. Other embodiments, which are conceived bythose having ordinary skills in the art on the basis of the disclosedembodiments without inventive efforts, should fall within the scope ofthe present disclosure.

FIG. 1 shows a block diagram of a conventional unmanned aerial vehicle(UAV), which comprises a battery 10, a main processor 11, a propulsiondevice 12, and charging interface 13. In some instances, the battery 10comprises a first cell unit 101, a second cell unit 102, and a batterycontrol circuit 103.

The battery 10 can provide power to the main processor 11 and thepropulsion device 12. Charging device (not shown) can charge the battery10 through charging interface 13.

If the first cell unit 101 or the second cell unit 102 fails, thebattery control circuit 103 can detect the failure and immediately turnoff a metal-oxide-semiconductor (MOS) transistor 104 to ensure a safetyof the battery. As a result, an operation of the main processor 11 andthe propulsion device 12 is terminated due to a power loss, and the UAVmay crash if it is in flight.

The disclosure provides an improved technical solution where the mainprocessor 11 and the propulsion device 12 can operate even if the firstcell unit 101 or the second cell unit 102 fails. FIG. 2 shows a blockdiagram of an example battery 20 in accordance with embodiments of thedisclosure. As shown in FIG. 2, the battery 20 comprises a first cellunit 201, a first control circuit 202, a second cell unit 203, and asecond control circuit 204. The first control circuit 202 iselectrically connected with the first cell unit 201. The first controlcircuit 202 can be configured to monitor a failure of the first cellunit 201 and disconnect an electrical connection between the first cellunit 201 and a power output terminal 2021 of the first control circuit202 if the first cell unit 201 fails, such that a discharging orcharging of the first cell unit 201 is terminated. The second controlcircuit 204 is electrically connected with the second cell unit 203. Thesecond control circuit 204 can be configured to monitor a failure of thesecond cell unit 203 and disconnect an electrical connection between thesecond cell unit 203 and a power output terminal 2041 of the secondcontrol circuit 204 if the second cell unit 203 fails, such that adischarging or charging of the second cell unit 203 is terminated. Thefirst cell unit 201 and the second cell unit 203 can be connected inparallel. Each of the first cell unit 201 and the second cell unit 203can comprise at least one cell.

In some embodiments, the battery 20 can comprise more than two cellunits, each of which is electrically connected to a respective controlcircuit. In the embodiments that the battery 20 comprises more than twocell units, two or more than two cell units may fail. As long as not allof the cell units of the battery fail, a non-failed cell unit can stillpower an external device, such that the device being powered cancontinue its operation at a low electric energy state. The failed cellunits can be activated if an activation condition is satisfied. In someembodiments, the battery 20 can be a lithium battery.

In some embodiments, the number of cells in the first cell unit 201 canbe identical to the number of cells in the second cell unit 203. In someother embodiments, the number of cells in the first cell unit 201 isdifferent from the number of cells in the second cell unit 203. In theseembodiments, a switch power supply DC/DC converter can be provided tothe first control circuit 202 or the second control circuit 204. TheDC/DC converter can convert an input voltage into a preset outputvoltage, such that voltages at various branch circuits can be balanced.

In some embodiments of the disclosure, as shown in FIG. 2, the firstcontrol circuit 202 comprises a first signal output terminal 2022through which a signal indicating a failure in the first cell unit 201can be transmitted if the first cell unit 201 fails. In some embodimentsof the disclosure, a communication transmission through the signaloutput 2022 can be terminated if the first cell unit 201 fails.

In some embodiments of the disclosure, as shown in FIG. 2, the secondcontrol circuit 204 comprises a second signal output terminal 2042through which a signal indicating a failure in the second cell unit 203can be transmitted if the second cell unit 203 fails. In someembodiments of the disclosure, a communication transmission through thesignal output 2042 can be terminated if the second cell unit 203 fails.

In some embodiments of the disclosure, the second control circuit 204can communicate with the first control circuit 202.

In some embodiments of the disclosure, the first control circuit 202 cantransmit a signal indicating a failure in the second cell unit 203 orthe second control circuit 204 if the second cell unit 203 or the secondcontrol circuit 204 fails.

In some embodiments, the first control circuit 202 can transmit to anexternal device a signal indicating a failure in the second cell unit203 if the second cell unit 203 fails. Further, the first controlcircuit 202 can transmit to an external device a signal indicating afailure in the second control circuit 204 if the second control circuit204 fails.

In some embodiments of the disclosure, the second control circuit 204can transmit a signal indicating a failure in the first cell unit 201and/or the first control circuit 202 if the first cell unit 201 and/orthe first control circuit 202 fail.

In some embodiments, the second control circuit 204 can transmit to anexternal device a signal indicating a failure in the first cell unit 201if the first cell unit 201 fails. Further, the second control circuit204 can transmit to an external device a signal indicating a failure inthe first control circuit 202 if the first control circuit 202 fails.The second control circuit 204 can transmit a signal indicating afailure in the first cell unit 201 and the first control circuit 202 ifthe first cell unit 201 and the first control circuit 202 both fail.

FIG. 3 shows the battery 20 in accordance with another embodiment of thedisclosure. As shown in FIG. 3, the first control circuit 202 comprisesa monitoring circuit 2023 and a MOS transistor 2024. The monitoringcircuit 2023 can output a control signal to the MOS transistor 2024 ifthe first cell unit 201 fails. The MOS transistor 2024 can disconnect anelectrical connection between the first cell unit 201 and the poweroutput terminal 2021 of the first control circuit 202 based upon thecontrol signal.

In some embodiments of the disclosure, the first control circuit 202 canbe configured to detect whether a current of the first cell unit 201exceeds a first current threshold. A determination that the first cellunit 201 fails can be made if the current of the first cell unit 201exceeds the first current threshold.

In some embodiments of the disclosure, the first control circuit 202 canbe configured to detect whether a voltage of at least one cell in thefirst cell unit 201 exceeds a first voltage threshold. A determinationthat the first cell unit 201 fails can be made if the voltage of the atleast one cell in the first cell unit 201 exceeds the first voltagethreshold.

In some embodiments of the disclosure, the first control circuit 202 canbe configured to detect whether a voltage of at least one cell in thefirst cell unit 201 is below a second voltage threshold. A determinationthat the first cell unit 201 fails can be made if the voltage of the atleast one cell in the first cell unit 201 is below the second voltagethreshold.

In some embodiments of the disclosure, the first control circuit 202 canbe configured to detect whether a temperature of at least one cell inthe first cell unit 201 is within a first preset temperature range. Adetermination that the first cell unit 201 fails can be made if thetemperature of the at least one cell in the first cell unit 201 isoutside the first preset temperature range.

In some embodiments of the disclosure, as shown in FIG. 3, the secondcontrol circuit 204 comprises a monitoring circuit 2043 and a MOStransistor 2044. The monitoring circuit 2041 can output a control signalto the MOS transistor 2044 if the second cell unit 203 fails. The MOStransistor 2042 can disconnect an electrical connection between thesecond cell unit 203 and the power output terminal 2041 of the secondcontrol circuit 204 based upon the control signal.

In some embodiments of the disclosure, the second control circuit 204can be configured to detect whether a current of the second cell unit203 exceeds a second current threshold. A determination that the secondcell unit 203 fails can be made if the current of the second cell unit203 exceeds the second current threshold.

In some embodiments of the disclosure, the second control circuit 204can be configured to detect whether a voltage of at least one cell inthe second cell unit 203 exceeds a third voltage threshold. Adetermination that the second cell unit 203 fails can be made if thevoltage of the at least one cell in the second cell unit 203 exceeds thethird voltage threshold.

In some embodiments of the disclosure, the second control circuit 204can be configured to detect whether a voltage of at least one cell inthe second cell unit 203 is below a fourth voltage threshold. Adetermination that the second cell unit 203 fails can be made if thevoltage of the at least one cell in the second cell unit 203 is belowthe fourth voltage threshold.

In some embodiments of the disclosure, the second control circuit 204can be configured to detect whether a temperature of at least one cellin the second cell unit 203 is within a second preset temperature range.A determination that the second cell unit 203 fails can be made if thetemperature of the at least one cell in the second cell unit 203 isoutside the second preset temperature range.

In some embodiments of the disclosure, as shown in FIG. 3, the battery20 further comprises an alarm device 205. The first control circuit 202and the second control circuit 204 are both in communication connectionwith the alarm device 205. The alarm device 205 can generate an alarm ifthe first cell unit 201 and/or the second cell unit 203 fails.

In some embodiments of the disclosure, the first control circuit 202 candirect the alarm device 205 to generate an alarm if the first cell unit201 fails.

In some embodiments of the disclosure, the second control circuit 204can direct the alarm device 205 to generate an alarm if the second cellunit 203 fails.

In some instances, the first control circuit 202 and the second controlcircuit 204 can both direct the alarm device 205 to generate an alarm ifthe first cell unit 201 and the second cell unit 203 both fail.

In some embodiments of the disclosure, the first control circuit 202 andthe second control circuit 204 can communicate with each other. Thefirst control circuit 202 can direct the alarm device 205 to generate analarm if the second cell unit 203 and/or the second control circuit 204fails.

In some embodiments of the disclosure, the first control circuit 202 andthe second control circuit 204 can communicate with each other. Thesecond control circuit 204 can direct the alarm device 205 to generatean alarm if the first cell unit 201 and/or the first control circuit 202fails.

In some instances, either one of the first control circuit 202 and thesecond control circuit 204 can direct the alarm device 205 to generatean alarm if the first cell unit 201 and/or the second cell unit 202fails.

In some embodiments of the disclosure, the alarm device 205 can comprisea loudspeaker providing an audible alarm if the first cell unit 201and/or the second cell unit 203 fails.

In some embodiments of the disclosure, the alarm device 205 can comprisean indicator lamp providing a visual alarm if the first cell unit 201and/or the second cell unit 203 fails.

In some instances, the alarm device 205 can comprise both a loudspeakerand an indicator lamp. The alarm device can provide both an audiblealarm and a visual alarm if the first cell unit 201 and/or the secondcell unit 203 fails.

Optionally, in some embodiments of the present disclosure, the firstcontrol circuit 202 and the second control circuit 204 can be integratedin the same circuit module.

In some instances, the embodiments shown in FIGS. 2 and 3 and otherembodiments can be combined with one another provided that they aretechnically compatible. A detailed description is omitted.

In some instances, the battery can provide a power to a flight controlsystem of, for example, an unmanned aerial vehicle. FIG. 4 shows a blockdiagram of an example flight control system 40 in accordance withembodiments of the disclosure. The flight control system 40 comprises amain processor 401 configured to detect whether the battery fails andperform a fault handling process and a propulsion device 402 configuredto reduce an output power according to the fault handling process.

In some embodiments, the remaining cell(s) of the battery can continuepowering the main processor 401 and the propulsion device 402 even ifsome cells of the battery fail. In these embodiments, an electricalcurrent outputted from the battery can be decreased, and a powerprovided to an external device, e.g., the flight control system 40, canalso be reduced. Once a battery failure is detected, the main processor401 can perform the failure handling process and direct the propulsiondevice 402 to reduce the propulsion output power.

In some embodiments of the disclosure, the main processor 401 can beconfigured to determine a battery failure if a failure signal from thebattery is received.

In some embodiments of the disclosure, the main processor 401 can beconfigured to detect whether a communication connection between the mainprocessor 401 and at least one control circuit of the battery isdisconnected, and determine a battery failure if the communicationconnection between the main processor 401 and the at least one controlcircuit of the battery is disconnected.

In some embodiments of the disclosure, the main processor 401 can beconfigured to detect whether a variation in an electric power parameteroutputted from the battery exceeds a preset threshold, and determine abattery failure if the variation in the electric power parameteroutputted from the battery exceeds the preset threshold.

In some embodiments, the electric power parameter comprises a current ora voltage. A value of the preset threshold can be determined based upona current or a voltage outputted from one cell unit. Optionally, a valueof the preset threshold can be determined based upon the number of cellsin one cell unit. Optionally, a value of the preset threshold can bedetermined based upon other types of parameters.

A voltage and a current outputted from the battery can be substantiallystable if the battery operates properly. A determination can be madethat at least one cell unit of the battery fails if a variation in theelectric power parameter outputted from the battery exceeds the presetthreshold. Likewise, a determination can be made that the batteryoperates properly if a variation in the electric power parameteroutputted from the battery does not exceed the preset threshold.

In some embodiments of the disclosure, the main processor 401 can beconfigured to perform a return process if a battery failure isdetermined.

The battery and the flight control system in accordance with embodimentsof the present disclosure are described hereinabove. A batterymanagement method in accordance with embodiments of the disclosure willbe described. FIG. 5 shows an example battery management method inaccordance with embodiments of the disclosure.

As shown in FIG. 5, at 501, whether a first cell unit or a second cellunit fails is detected.

In some embodiments, the battery can comprise the first cell unit andthe second cell unit which are connected in parallel. The battery candetect whether the first cell unit or the second cell unit fails. Aprocess at 502 can be performed if the first cell unit fails. A processat 503 can be performed if the second cell unit fails. A normaloperation can be performed if both the first cell unit and the secondcell unit do not fail. A detailed description on the normal operation isomitted.

At 502, powering or charging of the first cell unit is terminated if thefirst cell unit fails.

The battery can terminate powering or charging of the first cell unit ifthe first cell unit fails.

At 503, powering or charging of the second cell unit is terminated ifthe second cell unit fails.

The battery can terminate powering or charging of the second cell unitif the second cell unit fails.

In some embodiments of the disclosure, a first failure signal can betransmitted if the first cell unit fails. Additionally or alternatively,the first failure signal can be transmitted if the second cell unitfails.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit or the second cell unit fails can be effected bymonitoring the first cell unit and the second cell unit using a firstcontrol circuit and a second control circuit, respectively.

For example, the first control circuit can be used to detect whether thefirst cell unit and/or the second cell unit fails. Optionally, thesecond control circuit can be used to detect whether the second cellunit fails.

In some embodiments of the disclosure, the process of terminatingpowering or charging of the first cell unit if the first cell unit failsand terminating powering or charging of the second cell unit if thesecond cell unit fails can be effected by terminating powering orcharging of the first cell unit under a control of the first controlcircuit if the first cell unit fails and terminating powering orcharging of the second cell unit under a control of the second controlcircuit if the second cell unit fails.

In some embodiments of the disclosure, the method can comprisedisconnecting a communication connection between the first controlcircuit and an external device if the first cell unit fails.

In some embodiments of the disclosure, the method can comprisedisconnecting a communication connection between the second controlcircuit and an external device if the second cell unit fails.

In some embodiments of the disclosure, the first control circuit and thesecond control circuit can communicate with each other. The method cancomprise the second control circuit transmitting a signal indicating afailure in the first cell unit and/or the first control circuit if thefirst cell unit and/or the first control circuit fails.

For example, the second control circuit can transmit a signal indicatinga failure in the first cell unit if the first cell unit fails. Thesecond control circuit can transmit a signal indicating a failure in thefirst control circuit if the first control circuit fails.

In some embodiments of the disclosure, the first control circuit cantransmit a signal indicating a failure in the second cell unit and/orthe second control circuit if the second cell unit and/or the secondcontrol circuit fails.

In some embodiments, the first control circuit can transmit a signalindicating a failure in the second cell unit if the second cell unitfails. The first control circuit can transmit a signal indicating afailure in the second control circuit if the second control circuitfails.

In some embodiments of the disclosure, the first control circuit and thesecond control circuit can be integrated in one circuit module.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a current of the first cell unit exceeds a firstcurrent threshold, and determining the first cell unit fails if acurrent of the first cell unit exceeds the first current threshold.

In some embodiments, the first current threshold can be a maximumcurrent that can be carried by the first cell unit or the first controlcircuit in charging loop or a discharging loop. A value of the firstcurrent threshold is not restricted in the disclosure. The first cellunit can be determined as in an over-current state if the current of thefirst cell unit exceeds the first current threshold. The first cell unitor an electronic element of the first control circuit can be damagedunder the over-current state, therefore charging loop or the dischargingloop needs be disconnected. For example, if a fault occurs in a load incharging loop or the discharging loop, a short-circuit may occur in acell and an instantaneous load current in the control circuit mayexceed, for example, 10A. In this situation, the first control circuitcan disconnect charging loop or the discharging loop in severalmilliseconds to assure a safety of the first cell unit.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a voltage of at least one cell in the first cell unitexceeds a first voltage threshold, and determining the first cell unitfails if the voltage of the at least one cell in the first cell unitexceeds the first voltage threshold.

In some instances, the first voltage threshold is a maximum voltage thata cell can withstand. The first voltage threshold can be, e.g., 4.2V or4.3V. A specific value of the first voltage threshold is not limited inthe disclosure. When the first cell unit is charged by charging device,a voltage of a cell in the first cell unit can increase over time. Whenthe voltage of the cell exceeds the first voltage threshold, itindicates that the cell may be in an over-charge state, and adetermination that the first cell unit fails can be made.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a voltage of at least one cell in the first cell unitfalls below a second voltage threshold, and determining the first cellunit fails if the voltage of the at least one cell in the first cellunit falls below the second voltage threshold.

In some embodiments, the second threshold can be a minimum voltage thata cell can bear. The second threshold can be, e.g., 2.3V, 2.4V, or 2.5V.A specific value of the second voltage threshold is not limited in thedisclosure. Once the first control circuit detects that the voltage ofat least one cell in the first cell unit falls below the second voltagethreshold, it indicates that the cell may be in an over-discharge state,and a determination that the first cell unit fails can be made.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a temperature of at least one cell in the first cellunit is within a first preset temperature range, and determining thefirst cell unit fails if the temperature of the at least one cell in thefirst cell unit is outside the first preset temperature range.

In some instances, the first preset temperature range can be anoperating temperature range of the first cell unit. An efficiency ofelectrolytic reaction in an electrolyte solution may decrease if thetemperature of the cell unit is below a lower limit of the operatingtemperature range, and the electrolytic reaction may terminate if theelectrolyte solution is frozen. Thus, a determination that the firstcell unit fails can be made if the temperature of the cell unit is belowthe lower limit. On the other hand, a composition material of the cellunit may be subject to an irreversible change if the temperature of thecell unit is higher than an upper limit of the operating temperaturerange, and the cell unit may even explode at an excessively hightemperature. Thus, a determination that the first cell unit fails can bemade if the temperature of the cell unit is above the upper limit. Forexample, an operating temperature range for a lithium-thionyl chloridebattery can be between −50° C. and 75°. The operating temperature rangeof the cell unit can differ with different composition materials.Specific values of the upper limit and the lower limit of thetemperature range are not limited in the disclosure.

In some embodiments of the disclosure, the process of detecting whetherthe second cell unit fail can be effected by detecting whether a currentof the second cell unit exceeds a second current threshold, anddetermining the second cell unit fails if the current of the second cellunit exceeds the second current threshold.

In some embodiments of the disclosure, the process of detecting whetherthe second cell unit fails can be effected by detecting whether avoltage of at least one cell in the second cell unit exceeds a thirdvoltage threshold, and determining the second cell unit fails if thevoltage of the at least one cell in the second cell unit exceeds thethird voltage threshold.

In some embodiments of the disclosure, the process of detecting whetherthe second cell unit fails can be effected by detecting whether avoltage of at least one cell in the second cell unit falls below afourth voltage threshold, and determining the second cell unit fails ifthe voltage of the at least one cell in the second cell unit falls belowthe fourth voltage threshold.

In some embodiments of the disclosure, the process of detecting whetherthe second cell unit fails can be effected by detecting whether atemperature of at least one cell in the second cell unit is within asecond preset temperature range, and determining the second cell unitfails if the temperature of the at least one cell in the second cellunit is outside the second preset temperature range.

In some embodiments, the second preset temperature range can be anoperating temperature range of the second cell unit. The second cellunit can be similar to the first cell unit, thus a process of thebattery detecting whether the second cell unit fails can be similar to aprocess of the battery detecting whether the first cell unit fails. Adetailed description thereof is omitted.

In some embodiments of the disclosure, the method can further comprisegenerating an alarm if the first cell unit and/or the second cell unitfails.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and/or the second cell unit fails can be effected bydetecting whether the first cell unit and the second cell unit failusing a first control circuit and a second control circuit,respectively.

In some embodiments of the disclosure, the process of generating thealarm if the first cell unit and/or the second cell unit fails can beeffected by the first control circuit directing the alarm device togenerate the alarm if the first cell unit fails, and the second controlcircuit directing the alarm device to generate the alarm if the secondcell unit fails.

In some embodiments of the disclosure, the first control circuit and thesecond control circuit can communicate with each other, and the processof generating the alarm if the first cell unit and/or the second cellunit fails can be effected by the first control circuit directing thealarm device to generate the alarm if the second cell unit and/or thesecond control circuit fails, and the second control circuit directingthe alarm device to generate the alarm if the first cell unit and/or thefirst control circuit fails.

In some embodiments, the alarm device can include a loudspeaker or analarm lamp. The alarm device can include another device capable ofgenerating an alarm, which is not limited to the illustrative examples.

In some embodiments of the disclosure, the process of generating thealarm if the first cell unit and/or the second cell unit fails can beeffected by generating an audible alarm if the first cell unit and/orthe second cell unit fails.

In some embodiments of the disclosure, the process of generating thealarm if the first cell unit and/or the second cell unit fails can beeffected by generating a visual alarm if the first cell unit and/or thesecond cell unit fails.

In some embodiments, that the alarm device can comprise both aloudspeaker and an indicator lamp. The alarm device can generate boththe audible alarm and the visual alarm if the first cell unit and/or thesecond cell unit fails.

FIG. 6 shows another example battery management method in accordancewith embodiments of the disclosure. As shown in FIG. 6, at 601, whetherthe first cell unit and the second cell unit fail is detected using afirst control circuit and a second control circuit, respectively.

The battery can detect whether the first cell unit and the second cellunit fail using the first control circuit and the second controlcircuit, respectively. Process 602 or process 603 can be performed ifthe first cell unit fails. Process 604 or process 605 can be performedif the second cell unit fails.

At 602, the first control circuit directs the first cell unit toterminate powering or charging if the first cell unit fails.

At 603, the first control circuit directs the alarm device to generatean alarm if the first cell unit fails.

At 604, the second control circuit directs the second cell unit toterminate powering or charging if the second cell unit fails.

At 605, the second control circuit directs the alarm device to generatean alarm if the second cell unit fails.

Process 603 can be performed after or before process 602, and process604 can be performed after or before process 603. An order of performingthe processes is not limited to the illustrative example.

FIG. 7 shows an example flight control method in accordance withembodiments of the disclosure. As shown in FIG. 7, at 701, whether afirst cell unit and a second cell unit fail is detected.

In some embodiments, an unmanned aerial vehicle can comprise a battery.The battery can comprise the first cell unit and the second cell unit,which are connected with each other in parallel. The unmanned aerialvehicle can detect whether the first cell unit and the second cell unitfail. Process 702 can be performed if the first cell unit fails. Process703 can be performed if the second cell unit fails. A process ofdetecting whether the first cell unit and the second cell unit fail tosupply power to external devices can be performed if both the first cellunit and the second cell unit do not fail. A detailed descriptionthereof is omitted.

At 702, the first cell unit is directed to terminate powering if thefirst cell unit fails. For example, the unmanned aerial vehicle candirect the first cell unit to terminate powering if the first cell unitfails.

At 703, the second cell unit is directed to terminate powering if thesecond cell unit fails. For example, the unmanned aerial vehicle candirect the second cell unit to terminate powering if the second cellunit fails.

In some embodiments of the disclosure, the method can comprisetransmitting a signal indicating a failure in the first cell unit if thefirst cell unit fails.

In some embodiments of the disclosure, the method can comprisetransmitting a signal indicating a failure in the second cell unit ifthe second cell unit fails.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether the first cell unit and the second cell unit failusing a first control circuit and a second control circuit,respectively.

In some embodiments, the first control circuit can be configured todetect whether the first cell unit and/or the second cell unit fails.The second control circuit can be similarly configured to detect whetherthe first cell unit and/or the second cell unit fail.

In some embodiments of the disclosure, the process of directing thefirst cell unit to terminate powering if the first cell unit fails ordirecting the second cell unit to terminate powering if the second cellunit fails can be effected by the first control circuit directing thefirst cell unit to terminate powering or charging if the first cell unitfails, and the second control circuit directing the second cell unit toterminate powering or charging if the second cell unit fails.

In some embodiments of the disclosure, the method can further comprise,disconnecting a communication connection between the first controlcircuit and an external device if the first cell unit fails.

In some embodiments, the first control circuit can be in communicationconnection with the external device. The communication connectionbetween the first control circuit and the external device can bedisconnected if the first cell unit fails. The external device can learna failure of the first cell unit by detecting the communicationdisconnection.

In some embodiments of the disclosure, a communication connectionbetween the second control circuit and an external device can bedisconnected if the second cell unit fails.

In some embodiments, the second control circuit can be in communicationconnection with the external device. The communication connectionbetween the second control circuit and the external device can bedisconnected if the second cell unit fails. The external device canlearn a failure of the second cell unit by detecting the communicationdisconnection.

In some embodiments of the disclosure, the first control circuit and thesecond control circuit can communicate with each other. The method cancomprise the second control circuit transmitting a signal indicating afailure in the first cell unit and/or the first control circuit if thefirst cell unit and/or the first control circuit fails.

For example, the second control circuit can transmit a signal indicatinga failure in the first cell unit if the first cell unit fails. Thesecond control circuit can transmit a signal indicating a failure in thefirst control circuit if the first control circuit fails. The secondcontrol circuit can transmit a signal indicating a failure in the firstcell unit and the first control circuit if both the first cell unit andthe first control circuit fail.

In some embodiments of the disclosure, the first control circuit and thesecond control circuit can communicate with each other. The method cancomprise the first control circuit transmitting a signal indicating afailure in the second cell unit and/or the second control circuit if thesecond cell unit and/or the second control circuit fail.

For example, the first control circuit can transmit a signal indicatinga failure in the second cell unit if the second cell unit fails. Thefirst control circuit can transmit a signal indicating a failure in thesecond control circuit if the second control circuit fails. The firstcontrol circuit can transmit a signal indicating a failure in the secondcell unit and the second control circuit if both the second cell unitand the second control circuit fail.

In some embodiments of the disclosure, the first control circuit and thesecond control circuit can be integrated in one circuit module.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a current of the first cell unit exceeds a firstcurrent threshold, and determining the first cell unit fails if thecurrent of the first cell unit exceeds the first current threshold.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a voltage of at least one cell in the first cell unitexceeds a first voltage threshold, and determining the first cell unitfails if the voltage of the at least one cell in the first cell unitexceeds the first voltage threshold.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a voltage of at least one cell in the first cell unitis below a second voltage threshold, and determining the first cell unitfails if the voltage of the at least one cell in the first cell unitfalls below the second voltage threshold.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a temperature of at least one cell in the first cellunit is within a first preset temperature range, and determining thefirst cell unit fails if the temperature of the at least one cell in thefirst cell unit is outside the first preset temperature range.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a current of the second cell unit exceeds a secondcurrent threshold, and determining the second cell unit fails if thecurrent of the second cell unit exceeds the second current threshold.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a voltage of at least one cell in the second cell unitexceeds a third voltage threshold, and determining the second cell unitfails if the voltage of the at least one cell in the second cell unitexceeds the third voltage threshold.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a voltage of at least one cell in the second cell unitfalls below a fourth voltage threshold, and determining the second cellunit fails if the voltage of the at least one cell in the second cellunit falls below the fourth voltage threshold.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether a temperature of at least one cell in the second cellunit is within a second preset temperature range, and determining thesecond cell unit fails if the temperature of the at least one cell inthe second cell unit is outside a second preset temperature range.

In some embodiments of the disclosure, the method can comprisetransmitting an alarm to a ground terminal if the first cell unit and/orthe second cell unit fails.

In some embodiments, the ground terminal can be a remote controller oranother ground control device of a ground control station. The groundterminal is not limited to the illustrative examples. The unmannedaerial vehicle can transmit the alarm to the ground terminal using analarm device if the first cell unit or/the second cell unit fails. Insome embodiments, the alarm device can be provided at the battery, theunmanned aerial vehicle, or the remote controller. A location of thealarm device is not limited to the illustrative examples. The unmannedaerial vehicle can transmit to the remote controller informationindicating a failure in the battery of the unmanned aerial vehicle ifthe alarm device is provided at the remote controller, and the alarmdevice of the remote controller can generate an alarm.

In some embodiments of the disclosure, the process of detecting whetherthe first cell unit and the second cell unit fail can be effected bydetecting whether the first cell unit and the second cell unit failusing a first control circuit and a second control circuit,respectively.

In some embodiments of the disclosure, the process of generating thealarm if the first cell unit and/or the second cell unit fails can beeffected by the first control circuit directing the alarm device togenerate an alarm if the first cell unit fails, and the second controlcircuit directing the alarm device to generate an alarm if the secondcell unit fails.

In some embodiments, the battery can comprise the alarm device. Thefirst control circuit and the second control circuit can both be incommunication connection with the alarm device. The first controlcircuit can be configured to direct the alarm device to generate analarm if the first cell unit fails. The second control circuit can beconfigured to direct the alarm device to generate an alarm if the secondcell unit fails.

In some embodiments of the disclosure, the first control circuit and thesecond control circuit can communicate with each other. The process ofgenerating the alarm if the first cell unit and/or the second cell unitfail can be effected by the first control circuit directing the alarmdevice to generate an alarm if the second cell unit and/or the secondcontrol circuit fails, and the second control circuit directing thealarm device to generate an alarm if the first cell unit and/or thefirst control circuit fails.

In some embodiments, the battery can comprise the alarm device. Thefirst control circuit and the second control circuit can both be incommunication connection with the alarm device. The first controlcircuit can be configured to direct the alarm device to generate analarm if the second cell unit and/or the second control circuit fails.The second control circuit can be configured to direct the alarm deviceto generate an alarm if the first cell unit and/or the first controlcircuit fails.

In some embodiments of the disclosure, the process of generating thealarm if the first cell unit and/or the second cell unit fails can beeffected by generating an audible alarm if the first cell unit and/orthe second cell unit fails.

In some embodiments, a flight control system can comprise the alarmdevice. If the first cell unit and/or the second cell unit fails, theflight control system can detect the failure and direct the alarm deviceto generate an audible alarm.

In some embodiments of the disclosure, the process of generating thealarm if the first cell unit and/or the second cell unit fails can beeffected by generating a visual alarm if the first cell unit and/or thesecond cell unit fails.

In some embodiments, if the first cell unit and/or the second cell unitfails, the flight control system can detect the failure and direct thealarm device to generate a visual alarm.

In some embodiments of the disclosure, the method can comprise directingthe unmanned aerial vehicle to enter into a power shortage mode if thefirst cell unit or the second cell unit fails.

In some embodiments, the first cell unit can terminate powering to theflight control system of the unmanned aerial vehicle if the first cellunit fails, therefore an energy available to the flight control systemis reduced. In these embodiments, the flight control system can directthe unmanned aerial vehicle to enter into the power shortage mode.

In some embodiments of the disclosure, the process of directing theunmanned aerial vehicle to enter into the power shortage mode can beeffected by reducing a propulsion output power of the unmanned aerialvehicle.

For example, the flight control system can direct to reduce thepropulsion output power of the unmanned aerial vehicle.

In some embodiments of the disclosure, the process of directing theunmanned aerial vehicle to enter into the power shortage mode can beeffected by directing the unmanned aerial vehicle to perform anautomatic return flight.

For example, the flight control system can direct the unmanned aerialvehicle to perform the automatic return flight.

In some embodiments of the disclosure, the process of directing theunmanned aerial vehicle to enter into the power shortage mode can beeffected by directing the unmanned aerial vehicle to perform a directlanding.

For example, the flight control system can control the unmanned aerialvehicle to perform the direct landing.

The process of reducing the propulsion output power can be performedsimultaneously with the process of directing the unmanned aerial vehicleto perform the automatic return flight or directing the unmanned aerialvehicle to perform the direct landing by the flight control system. Adetailed description thereof is omitted.

The embodiment shown in FIG. 7 and other embodiments can be combinedwith one another provided that they are technically compatible. Adetailed description thereof is omitted.

FIG. 8 shows a flow chart of another example flight control method inaccordance with embodiments of the disclosure. As shown in FIG. 8, at801, whether a first cell unit or a second cell unit fails is detectedusing a first control circuit and a second control circuit,respectively.

At 802, the first cell unit is directed to terminate powering orcharging if the first cell unit fails.

At 803, an alarm device is directed to generate an audible alarm orgenerate a visual alarm if the first cell unit fails.

At 804, the second cell unit is directed to terminate powering orcharging if the second cell unit fails.

At 805, the alarm device is directed to generate an audible alarm orgenerate a visual alarm if the second cell unit fails.

Process 803 can be performed after or before process 802, and process805 can be performed after or before process 804. An order of performingthe processes is not limited to the illustrative example.

The flight control method in accordance with embodiments of thedisclosure will be will be described by reference to a specificapplication scenario.

In the specific application scenario of the embodiment, an unmannedaerial vehicle can comprise a battery. The battery can comprise a cellunit 1 and a cell unit 2.

In some embodiments, the battery can further comprise a control circuit1 and a control circuit 2 where the control circuit 1 can be a failuremonitoring circuit of the cell unit 1 and the control circuit 2 can be afailure monitoring circuit of the cell unit 2. The control circuit 1 ofthe battery can be configured to detect a failure of the cell unit 1. Ifa failure of the cell unit 1 is detected, the control circuit 1 candisconnect a circuit between the cell unit 1 and a flight control systemand the flight control system can enter into a power shortage mode.

In some embodiments, the control circuit 1 can transmit to the flightcontrol system of the unmanned aerial vehicle a signal error1 indicatinga failure of the cell unit 1. The flight control system can reduce apropulsion output power based upon the signal error1 and direct theunmanned aerial vehicle to perform an automatic return flight.

In some embodiments, the battery can comprise a loudspeaker and anindicator lamp. The control circuit 1 can direct the loudspeaker togenerate an audible alarm and direct the indicator lamp to generate avisual alarm if the cell unit 1 fails.

In some embodiments, the control circuit 1 and the control circuit 2 cancommunicate with each other. The control circuit 1 can be configured tofurther detect a failure of the cell unit 2 or a failure of the controlcircuit 2. The control circuit 1 can transmit to the flight controlsystem of the unmanned aerial vehicle a signal error2 indicating afailure of the cell unit 2 if a failure of the cell unit 2 or a failureof the control circuit 2 is detected. The flight control system canreduce the propulsion output power based upon the signal error2 anddirect the unmanned aerial vehicle to perform the automatic returnflight.

In some embodiments, the flight control system can determine a failureof the cell unit 1 fails and direct the unmanned aerial vehicle toperform an automatic return flight if detecting a disconnection of thecircuit between the cell unit 1 and the flight control system.

In case no control circuit is provided to the battery, if the flightcontrol system detects a failure of the cell unit 1, the flight controlsystem can disconnect a supply circuit through which the cell unit 1provides power to an external device, reduce the propulsion output powerand direct the alarm device to generate an alarm.

The above-described embodiments are merely illustrative embodiments.Other embodiments can be appreciated with reference to FIG. 7 or FIG. 8.A detailed description thereof is omitted.

FIG. 9 shows an example unmanned aerial vehicle 90 in accordance withembodiments of the disclosure. The unmanned aerial vehicle 90 comprisesa propulsion device 901, a battery 902, and a main processor 903.

The propulsion device 901 can be configured to provide a propulsion,e.g., for the unmanned aerial vehicle 90 to fly. The battery 902 canprovide an electric energy to the propulsion device 90. In someembodiments, as shown in FIG. 9, the battery 902 comprises a first cellunit 9021, a first control circuit 9022, a second cell unit 9023, and asecond control circuit 9024. The first cell unit 9021 and the secondcell unit 9023 can be connected with each other in parallel. Each of thefirst cell unit 9021 and the second cell unit 9023 can comprise at leastone cell. The first control circuit 9022 can be electrically connectedwith the first cell unit 9021 to detect a failure of the first cell unit9021. The second control circuit 9024 can be electrically connected withthe second cell unit 9023 to detect a failure of the second cell unit9023. The first control circuit 9022 can direct the first cell unit 9021to terminate powering or charging if the first cell unit 9021 fails. Thesecond control circuit 9024 can direct the second cell unit 9023 toterminate powering or charging if the second cell unit 9023 fails.

The main processor 903 can be configured to control a flight parameter.The main processor 903 can be electrically connected with the propulsiondevice 901 and the battery 902.

In some embodiments of the disclosure, the first control circuit 9022can transmit to the main processor 903 a signal indicating a failure inthe first cell unit 9021 if the first cell unit 9021 fails.

In some embodiments of the disclosure, the first control circuit 9022can disconnect a transmission with the main processor 903 if the firstcell unit 9021 fails.

In some embodiments of the disclosure, the second control circuit 9024can transmit to the main processor 903 a signal indicating a failure inthe second cell unit 9023 if the second cell unit 9023 fails.

In some embodiments of the disclosure, the second control circuit 9024can disconnect a transmission to the main processor 903 if the secondcell unit 9023 fails.

In some embodiments of the disclosure, the second control circuit 9024and the first control circuit 9022 can communicate with each other.

In some embodiments of the disclosure, the first control circuit 9022can transmit to the main processor 903 a signal indicating a failure inthe second cell unit 9023 or the second control circuit 9024 if thesecond cell unit 9023 or the second control circuit 9024 fails, and/or,the second control circuit 9024 can transmit to the main processor 902 asignal indicating a failure in the first cell unit 9021 or in the firstcontrol circuit 9022 if the first cell unit 9021 or the first controlcircuit 9022 fails.

In some embodiments of the disclosure, the first control circuit 9022can comprise a monitoring circuit and a MOS transistor. The monitoringcircuit can output a control signal to the MOS transistor if the firstcell unit 9021 fails. The MOS transistor can disconnect an electricalconnection between the first cell unit 9021 and a power output terminalof the first control circuit 9022 in response to the control signal.

In some embodiments of the disclosure, the first control circuit 9022can detect whether a current of the first cell unit 9021 exceeds a firstcurrent threshold. A determination that the first cell unit 9201 failscan be made if the current of the first cell unit 9021 exceeds the firstcurrent threshold.

In some embodiments of the disclosure, the first control circuit 9022can be configured to detect whether a voltage of at least one cell inthe first cell unit 9021 exceeds a first voltage threshold. Adetermination that the first cell unit 9201 fails can be made if thevoltage of the at least one cell in the first cell unit 9201 exceeds thefirst voltage threshold.

In some embodiments of the disclosure, the first control circuit 9022can be configured to detect whether a voltage of at least one cell inthe first cell unit 9021 is below a second voltage threshold. Adetermination that the first cell unit 9201 fails can be made if thevoltage of the at least one cell in the first cell unit 9201 is belowthe second voltage threshold.

In some embodiments of the disclosure, the first control circuit 9022can be configured to detect whether a temperature of at least one cellin the first cell unit 9021 is within a first preset temperature range.A determination that the first cell unit 9201 fails can be made if thetemperature of the at least one cell in the first cell unit 9201 isoutside the first preset temperature range.

In some embodiments of the disclosure, the second control circuit 9024can comprise a monitoring circuit and a MOS transistor. The monitoringcircuit can output a control signal to the MOS transistor if the secondcell unit fails. The MOS transistor can disconnect an electricalconnection between the second cell unit and a power output terminal ofthe second control circuit in response to the control signal.

In some embodiments of the disclosure, the second control circuit 9024can be configured to detect whether a current of the second cell unit9023 exceeds a second current threshold. A determination that the secondcell unit 9203 fails can be made if the current of the second cell unit9023 exceeds the second current threshold. In some instances, the secondcurrent threshold can be identical to the first current threshold.Optionally, the second current threshold can be different from the firstcurrent threshold.

In some embodiments of the disclosure, the second control circuit 9024can be configured to detect whether a voltage of at least one cell inthe second cell unit 9023 exceeds a third voltage threshold. Adetermination that the second cell unit 9203 fails can be made if thevoltage of the at least one cell in the second cell unit 9023 exceedsthe third voltage threshold.

In some embodiments, the third voltage threshold can be identical to thefirst voltage threshold. Optionally, the third voltage threshold can bedifferent from the first voltage threshold.

In some embodiments of the disclosure, the second control circuit 9024can be configured to detect whether a voltage of at least one cell inthe second cell unit 9023 is below a fourth voltage threshold. Adetermination that the second cell unit 9203 fails can be made if thevoltage of the at least one cell in the second cell unit 9023 is belowthe fourth voltage threshold.

In some embodiments, the fourth voltage threshold can be identical tothe second voltage threshold. Optionally, the fourth voltage thresholdcan be different from the second voltage threshold.

In some embodiments of the disclosure, the second control circuit 9024can be configured to detect whether a temperature of at least one cellin the second cell unit 9023 is within a second preset temperaturerange. A determination that the second cell unit 9203 fails can be madeif the temperature of the at least one cell in the second cell unit 9023is outside the second preset temperature range.

In some embodiments, the second preset temperature range can beidentical to the first preset temperature range. Optionally, the secondpreset temperature range can be different from the first presettemperature range.

In some embodiments of the disclosure, as shown in FIG. 9, the battery902 further comprises an alarm device 9025. The first control circuit9022 and the second control circuit 9024 can both be in communicationconnection with the alarm device 9025. The alarm device 9025 cangenerate an alarm if the first cell unit 9021 and/or the second cellunit 9023 fails.

In some embodiments of the disclosure, the first control circuit 9022can direct the alarm device 9025 to generate an alarm if the first cellunit 9021 fails. Additionally or alternatively, the second controlcircuit 9024 can direct the alarm device 9025 to generate an alarm ifthe second cell unit 9023 fails.

In some embodiments of the disclosure, the first control circuit 9022and the second control circuit 9024 can communicate with each other. Thefirst control circuit 9022 can direct the alarm device 9025 to generatean alarm if the second cell unit 9023 and/or the second control circuit9024 fails.

In some embodiments of the disclosure, the first control circuit 9022and the second control circuit 9024 can communicate with each other. Thesecond control circuit 9024 can direct the alarm device 9025 to generatean alarm if the first cell unit 9021 and/or the first control circuit9023 fails.

In some embodiments of the disclosure, the alarm device 9025 cancomprise a loudspeaker providing an audible alarm if the first cell unitand/or the second cell unit fails.

In some embodiments of the disclosure, the alarm device 9025 cancomprise an indicator lamp providing a visual alarm if the first cellunit and/or the second cell unit fails.

In some embodiments of the disclosure, the first control circuit 9022and the second control circuit 9024 can be integrated in the samecircuit module.

In some embodiments of the disclosure, the main processor 903 can beconfigured to enter into a power shortage mode upon receiving a failuresignal of the battery 902.

In some embodiments of the disclosure, the main processor 903 can beconfigured to reduce a propulsion output power of the unmanned aerialvehicle 90 upon receiving a failure signal of the battery 902. In someother embodiments, the main processor 903 can be configured to directthe unmanned aerial vehicle 90 to perform an automatic return flightupon receiving the failure signal of the battery 902. In some otherembodiments, the main processor 903 can be configured to direct theunmanned aerial vehicle 90 to perform a direct landing upon receivingthe failure signal of the battery 902.

The battery 902 in accordance with embodiments of the disclosure can besimilar to the battery 20 shown in FIG. 2. A detailed descriptionthereof is omitted. An interaction between various components of thebattery 902 can be similar to the embodiment or optional embodiments ofthe example device described with reference to FIG. 2 or FIG. 3.

The embodiment shown in FIG. 9 and other embodiments can be combinedwith one another provided they are technically compatible. A detaileddescription thereof is omitted.

FIG. 10 shows an example kit 100 for assembling as an unmanned aerialvehicle in accordance with embodiments of the disclosure. The kit 100comprises a propulsion device 1001, a battery 1002, and a main processor1003.

The propulsion device 1001 can be configured to provide a propulsion,e.g., for flight. The battery 1002 can provide an electric energy to thepropulsion device 1001. In some embodiments, as shown in FIG. 10, thebattery 1002 comprises a first cell unit 10021, a first control circuit10022, a second cell unit 10023, and a second control circuit 10024. Thefirst cell unit 10021 and the second cell unit 10023 can be connectedwith each other in parallel. The first cell unit 10021 and the secondcell unit 10023 can comprise at least one cell. The first controlcircuit 10022 can be electrically connected with the first cell unit10021 to detect a failure of the first cell unit 10021. The secondcontrol circuit 10024 can be electrically connected with the second cellunit 10023 to detect a failure of the second cell unit 10023.

The main processor 1003 can be configured to control a flight parameter.In some embodiments, once the kit 100 of the unmanned aerial vehicle isassembled, the main processor 1003 can be electrically connected withthe propulsion device 1001 and the battery 1002. The first controlcircuit 10022 can direct the first cell unit 10021 to terminate poweringor charging if the first cell unit 10021 fails. The second controlcircuit 10024 can direct the second cell unit 10023 to terminatepowering or charging if the second cell unit 10023 fails.

In some embodiments, the first control circuit 10022 can disconnect anelectrical connection between the cell unit 10021 and an externaldevice, terminate charging of first cell unit 10021 from the externaldevice or terminate powering the propulsion device 1001.

In some embodiments of the disclosure, the first control circuit 10022can transmit to the main processor 1003 a signal indicating a failure inthe first cell unit 10021 if the first cell unit 10021 fails.

In some embodiments of the disclosure, the first control circuit 10022can disconnect a transmission with the main processor 1003 if the firstcell unit 10021 fails.

In some embodiments of the disclosure, the second control circuit 10024can transmit to the main processor 1003 a signal indicating a failure inthe second cell unit 10023 if the second cell unit 10023 fails.

In some embodiments of the disclosure, the second control circuit 10024can disconnect a transmission to the main processor 1003 if the secondcell unit 10023 fails.

In some embodiments of the disclosure, the second control circuit 10024and the first control circuit 10022 can communicate with each other.

In some embodiments of the disclosure, the first control circuit 10022can transmit to the main processor 1003 a signal indicating a failure inthe second cell unit 10023 or the second control circuit 10024 if thesecond cell unit 10023 or the second control circuit 10024 fails.

In some embodiments of the disclosure, the second control circuit 10024can transmit to the main processor 1002 a signal indicating a failure inthe first cell unit 10021 or in the first control circuit 10022 if thefirst cell unit 10021 or the first control circuit 10022 fails.

The second control circuit 10024 can transmit to the main processor 1003a signal indicating a failure in the first cell unit 10021 if the firstcell unit 10021 fails. Additionally or alternatively, the second controlcircuit 10024 can transmit to the main processor 1003 a signalindicating a failure in the first control circuit 10022 if the firstcontrol circuit 10022 fails.

In some embodiments of the disclosure, the first control circuit 10022can comprise a monitoring circuit and a MOS transistor. The monitoringcircuit can output a control signal to the MOS transistor if the firstcell unit fails. The MOS transistor can disconnect an electricalconnection between the first cell unit and a power output terminal ofthe first control circuit in response to the control signal.

In some embodiments of the disclosure, the first control circuit 10022can detect whether a current of the first cell unit exceeds a firstcurrent threshold. A determination that the first cell unit fails can bemade if the current of the first cell unit exceeds the first currentthreshold.

In some embodiments of the disclosure, the first control circuit 10022can be configured to detect whether a voltage of at least one cell inthe first cell unit exceeds a first voltage threshold. A determinationthat the first cell unit fails can be made if the voltage of the atleast one cell in the first cell unit exceeds the first voltagethreshold.

In some embodiments of the disclosure, the first control circuit 10022can be configured to detect whether a voltage of at least one cell inthe first cell unit is below a second voltage threshold. A determinationthat the first cell unit fails can be made if the voltage of the atleast one cell in the first cell unit is below the second voltagethreshold.

In some embodiments of the disclosure, the first control circuit 10022can be configured to detect whether a temperature of at least one cellin the first cell unit is within a first preset temperature range. Adetermination that the first cell unit fails can be made if thetemperature of the at least one cell in the first cell unit is outsidethe first preset temperature range.

In some embodiments of the disclosure, the second control circuit 10024can comprise a monitoring circuit and a MOS transistor. The monitoringcircuit can output a control signal to the MOS transistor if the secondcell unit fails. The MOS transistor can disconnect an electricalconnection between the second cell unit and a power output terminal ofthe second control circuit in response to the control signal.

In some embodiments of the disclosure, the second control circuit 10024can be configured to detect whether a current of the second cell unitexceeds a second current threshold. A determination that the second cellunit fails can be made if the current of the second cell unit exceedsthe first current threshold.

In some embodiments of the disclosure, the second control circuit 10024can be configured to detect whether a voltage of at least one cell inthe second cell unit exceeds a third voltage threshold. A determinationthat the second cell unit fails can be made if the voltage of the atleast one cell in the second cell unit exceeds the third voltagethreshold.

In some embodiments of the disclosure, the second control circuit 10024can be configured to detect whether a voltage of at least one cell inthe second cell unit is below a fourth voltage threshold. Adetermination that the second cell unit fails can be made if the voltageof the at least one cell in the second cell unit is below the fourthvoltage threshold.

In some embodiments of the disclosure, the second control circuit 10024can be configured to detect whether a temperature of at least one cellin the second cell unit is within a second preset temperature range. Adetermination that the second cell unit fails can be made if thetemperature of the at least one cell in the second cell unit is outsidethe second preset temperature range.

In some embodiments of the disclosure, as shown in FIG. 10, the battery1002 further comprises an alarm device 10025. The first control circuit10022 and the second control circuit 10024 can both be in communicationconnection with the alarm device 10025. The alarm device 10025 cangenerate an alarm if the first cell unit 10021 and/or the second cellunit 10023 fails.

In some embodiments of the disclosure, the first control circuit 10022can direct the alarm device 10025 to generate an alarm if the first cellunit 10021 fails. Additionally or alternatively, the second controlcircuit 10024 can direct the alarm device 10025 to generate an alarm ifthe second cell unit 10023 fails.

In some embodiments of the disclosure, the first control circuit 10022and the second control circuit 10024 can communicate with each otherwhen the battery 1002 operates. The first control circuit 10022 candirect the alarm device 10025 to generate an alarm if the second cellunit 10023 and/or the second control circuit 10024 fails. Additionallyor alternatively, the second control circuit 10024 can direct the alarmdevice 10025 to generate an alarm if the first cell unit 10021 and/orthe first control circuit 10023 fails.

In some embodiments of the disclosure, the alarm device 10025 cancomprise a loudspeaker providing an audible alarm if the first cell unit10021 and/or the second cell unit 10023 fails.

In some embodiments of the disclosure, the alarm device 10025 cancomprise an indicator lamp providing a visual alarm if the first cellunit 10021 and/or the second cell unit 10023 fails.

In some embodiments of the disclosure, the first control circuit 10022and the second control circuit 10024 can be integrated in the samecircuit module.

In some embodiments of the disclosure, the main processor 1003 can beconfigured to enter into a power shortage mode upon receiving a failuresignal of the battery 1002.

In some embodiments of the disclosure, the main processor 1003 can beconfigured to reduce a propulsion output power of the unmanned aerialvehicle.

In some embodiments of the disclosure, the main processor 1003 can beconfigured to direct the unmanned aerial vehicle to perform an automaticreturn flight.

In some embodiments of the disclosure, the main processor 1003 can beconfigured to direct the unmanned aerial vehicle to perform a directlanding.

The battery 1002 in accordance with embodiments of the disclosure can besimilar to the battery 20 shown in FIG. 2. A detailed descriptionthereof is omitted. An interaction between various components in thebattery 1002 can be similar to the embodiment or optional embodiments ofthe example device described with reference to FIG. 2 or FIG. 3.

It will be apparent that, the embodiment shown in FIG. 10 and otherembodiments can be combined with one another provided they aretechnically compatible. A detailed description thereof is omitted.

FIG. 11 shows another example unmanned aerial vehicle 110 in accordancewith embodiments of the disclosure. The unmanned aerial vehicle 110comprises a propulsion device 1101, a battery 1102, and a main processor1103.

The propulsion device 1101 can be configured to provide a propulsion,e.g., for the unmanned aerial vehicle 110 to fly. The battery 1102 canprovide an electric energy to the propulsion device 1101. In someembodiments, as shown in FIG. 11, the battery 1102 comprises a firstcell unit 11021 and a second cell unit 11023 which are connected inparallel. Each of the first cell unit 11021 and the second cell unit11023 can comprise at least one cell.

The main processor 1103 can be electrically connected with thepropulsion device 1101 and the battery 1102. The main processor 1103 canbe configured to control a flight parameter and detect whether the firstcell unit 11021 and the second cell unit 11023 fail.

In some embodiments, the main processor 1103 can be configured to directthe first cell unit 11021 to terminate powering or charging if the firstcell unit 11021 fails and direct the second cell unit 11023 to terminatepowering or charging if the second cell unit 11023 fails.

In some embodiments of the disclosure, the main processor 1103 candetect whether a current of the first cell unit 11021 exceeds a firstcurrent threshold. A determination that the first cell unit 11021 failscan be made if the current of the first cell unit 11021 exceeds thefirst current threshold.

In some embodiments of the disclosure, the main processor 1103 can beconfigured to detect whether a voltage of at least one cell in the firstcell unit 11021 exceeds a first voltage threshold. A determination thatthe first cell unit 11021 fails can be made if the voltage of the atleast one cell in the first cell unit 11021 exceeds the first voltagethreshold.

In some embodiments of the disclosure, the main processor 1103 can beconfigured to detect whether a voltage of at least one cell in the firstcell unit 11021 is below a second voltage threshold. A determinationthat the first cell unit 11021 fails can be made if the voltage of theat least one cell in the first cell unit 11021 is below the secondvoltage threshold.

In some embodiments of the disclosure, the main processor 1103 can beconfigured to detect whether a temperature of at least one cell in thefirst cell unit 11021 is within a first preset temperature range. Adetermination that the first cell unit 11021 fails can be made if thetemperature of the at least one cell in the first cell unit 11021 isoutside the first preset temperature range.

In some embodiments of the disclosure, as shown in FIG. 11, the unmannedaerial vehicle 110 further comprise an alarm device 1104. The mainprocessor 1103 can be in communication connection with the alarm device1104. The alarm device 1104 can generate an alarm if the first cell unit11021 and/or the second cell unit 11023 fails.

In some embodiments of the disclosure, the alarm device 1104 cancomprise a loudspeaker providing an audible alarm if the first cell unit11021 and/or the second cell unit 11023 fails.

In some embodiments of the disclosure, the alarm device 1104 cancomprise an indicator lamp providing a visual alarm if the first cellunit 11021 and/or the second cell unit 11023 fails.

In some embodiments of the disclosure, the main processor 1103 can beconfigured to enter into a power shortage mode upon detecting a failurein the first cell unit 11021 or the second cell unit 11023.

In some embodiments of the disclosure, the power shortage mode cancomprise at least one of reducing an output power of the propulsiondevice 1101, directing the unmanned aerial vehicle 110 to perform anautomatic return flight, or directing the unmanned aerial vehicle 110 toperform a direct landing.

In some embodiments of the disclosure, the main processor 1103 can beconfigured to reduce an output power of the propulsion device 1101 upondetecting a failure in the first cell unit 11021 or the second cell unit11023.

In some embodiments of the disclosure, the main processor 1103 can beconfigured to direct the unmanned aerial vehicle 110 to perform anautomatic return flight upon detecting a failure in the first cell unit11021 or the second cell unit 11023.

In some embodiments of the disclosure, the main processor 1103 can beconfigured to direct the unmanned aerial vehicle 110 to perform a directlanding upon detecting a failure in the first cell unit 11021 or thesecond cell unit 11023.

The embodiment shown in FIG. 11 and other embodiments can be combinedwith one another provided they are technically compatible. A detaileddescription thereof is omitted.

FIG. 12 shows another example kit 120 for assembling an unmanned aerialvehicle in accordance with embodiments of the disclosure. The kit 120comprises a propulsion device 1201, a battery 1202, and a main processor1203.

The propulsion device 1201 can be configured to provide a propulsion,e.g., for flight. The battery 1202 can provide an electric energy to thepropulsion device 1201. In some embodiments, as shown in FIG. 12, thebattery 1202 comprises a first cell unit 12021 and a second cell unit12023 which are connected in parallel. Each of the first cell unit 12021and the second cell unit 12023 can comprise at least one cell.

The main processor 1203 can be configured to control a flight parameterand detect whether the first cell unit 12021 and the second cell unit12023 fail.

The main processor 1203 can be electrically connected with thepropulsion device 1201 and the battery 1202 upon assembling the kit1200. In some embodiments, the main processor 1203 can be configured todirect the first cell unit 12021 to terminate powering or charging ifthe first cell unit 12021 fails and direct the second cell unit 12023 toterminate powering or charging if the second cell unit 12023 fails.

In some embodiments of the disclosure, the main processor 1203 candetect whether a current of the first cell unit 12021 exceeds a firstcurrent threshold. A determination that the first cell unit 12021 failscan be made if the current of the first cell unit 12021 exceeds thefirst current threshold.

In some embodiments of the disclosure, the main processor 1203 candetect whether a current of the second cell unit 12023 exceeds a secondcurrent threshold. A determination that the second cell unit 12023 failscan be made if the current of the second cell unit 12023 exceeds thesecond current threshold.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to detect whether a voltage of at least one cell in the firstcell unit 12021 exceeds a first voltage threshold. A determination thatthe first cell unit 12021 fails can be made if the voltage of the atleast one cell in the first cell unit 12021 exceeds the first voltagethreshold.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to detect whether a voltage of at least one cell in thesecond cell unit 12023 exceeds a third voltage threshold. Adetermination that the second cell unit 12023 fails can be made if thevoltage of the at least one cell in the second cell unit 12023 exceedsthe third voltage threshold.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to detect whether a voltage of at least one cell in the firstcell unit 12021 is below a second voltage threshold. A determinationthat the first cell unit 12021 fails can be made if the voltage of theat least one cell in the first cell unit 12021 is below the secondvoltage threshold.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to detect whether a voltage of at least one cell in thesecond cell unit 12023 is below a fourth voltage threshold. Adetermination that the second cell unit 12023 fails can be made if thevoltage of the at least one cell in the second cell unit 12023 is belowthe fourth voltage threshold.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to detect whether a temperature of at least one cell in thefirst cell unit 12021 is within a first preset temperature range. Adetermination that the first cell unit 12021 fails can be made if thetemperature of the at least one cell in the first cell unit 12021 isoutside the first preset temperature range.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to detect whether a temperature of at least one cell in thesecond cell unit 12023 is within a second preset temperature range. Adetermination that the second cell unit 12023 fails can be made if thetemperature of the at least one cell in the second cell unit 12023 isoutside the second preset temperature range.

In some embodiments of the disclosure, as shown in FIG. 12, the kit 120further comprises an alarm device 1204. The alarm device 1204 cangenerate an alarm if the first cell unit 12021 and/or the second cellunit 12023 fails.

In some embodiments, the main processor 1203 can be in communicationconnection with the alarm device 1204 once the kit 120 is assembled.

In some embodiments of the disclosure, the alarm device 1204 cancomprise a loudspeaker providing an audible alarm if the first cell unit12021 and/or the second cell unit 12023 fails.

In some embodiments of the disclosure, the alarm device 1204 cancomprise an indicator lamp providing a visual alarm if the first cellunit 12021 and/or the second cell unit 12023 fails.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to enter into a power shortage mode upon detecting a failurein the first cell unit 12021 or the second cell unit 12023.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to reduce an output power of the propulsion device 1201 upondetecting a failure in the first cell unit 12021 or the second cell unit12023.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to direct the unmanned aerial vehicle to perform an automaticreturn flight upon detecting a failure in the first cell unit 12021 orthe second cell unit 12023.

In some embodiments of the disclosure, the main processor 1203 can beconfigured to direct the unmanned aerial vehicle to perform a directlanding upon detecting a failure in the first cell unit 12021 or thesecond cell unit 12023.

The embodiment shown in FIG. 12 and other embodiments can be combinedwith one another provided they are technically compatible. A detaileddescription thereof is omitted.

FIG. 13 shows a flow chart of another example flight control method ofan unmanned aerial vehicle in accordance with embodiments of thedisclosure. As shown in FIG. 13, at 1301, a main processor detectswhether a power supply unit of a power supply device fails. Process 1302can be performed if the power supply unit of the power supply devicefails.

In some embodiments, the unmanned aerial vehicle can comprise the mainprocessor, a propulsion device, and the power supply device. The powersupply device can provide power to the propulsion device. The powersupply device can comprise a plurality of power supply units thatprovide a power in parallel. Process 1302 can be performed if the mainprocessor of the unmanned aerial vehicle detects that the power supplyunit of the power supply device fails. The process stays at 1301 if themain processor detects that no power supply unit of the power supplydevice fails.

At 1302, a failure handling process is performed to reduce an outputpower if the power supply unit of the power supply device fails.

In some embodiments, the main processor can perform the failure handlingprocess if the power supply unit of the power supply device fails, andthe propulsion device can reduce the output power based upon the failurehandling process.

In some embodiments of the disclosure, the process of the main processordetecting whether the power supply unit of the power supply device failscan comprise the main processor of the unmanned aerial vehicledetermining the power supply device fails if the main processorreceiving a failure signal from the power supply device.

In some embodiments of the disclosure, the process of the main processordetecting whether the power supply unit of the power supply device failscan be effected by the main processor detecting whether a communicationconnection between the main processor and a control circuitcorresponding to at least one power supply unit of the power supplydevice is disconnected, and determining the power supply device fails ifthe communication connection is disconnected.

In some embodiments, each of the power supply units can be provided withone control circuit. A disconnection in the communication connectionbetween the control circuit and the main processor can indicate afailure in the power supply unit. Therefore, a determination that thepower supply device fails can be made.

In some embodiments of the disclosure, the process of the main processordetecting whether the power supply unit of the power supply device failscan be effected by the main processor detecting whether a variation inan electric parameter outputted from the power supply device exceeds apreset threshold, and determining the power supply device fails if thevariation exceeds the preset threshold.

In some embodiments of the disclosure, the failure handling process cancomprise a return flight process. The main processor performing afailure handling process can be effected by the main processorperforming the return flight process.

In some embodiments, the main processor can perform the return flightprocess if the power supply unit of the power supply device fails.

In some embodiments of the disclosure, the failure handling process cancomprise a direct landing process. The main processor performing afailure handling process can be effected by the main processorperforming the direct landing process.

In some embodiments, the main processor can perform the direct landingprocess if the power supply unit of the power supply device fails.

In some embodiments of the disclosure, the power supply device can be abattery, and the power supply unit can be a cell unit.

In some embodiments, the process of detecting whether the battery failscan be similar to the embodiment shown in FIG. 5. A detailed descriptionthereof is omitted.

In some embodiments of the disclosure, the power supply device cancomprise various types of batteries, and the power supply unit can be abattery.

In some embodiments, the power supply device can comprise a plurality ofbatteries of different types, and the power supply unit can be abattery. The plurality of batteries in the power supply device can be ofsame type or of different types.

FIG. 14 shows an example unmanned aerial vehicle 1400 in accordance withembodiments of the disclosure. The unmanned aerial vehicle 1400comprises a power supply device 1401 and a flight control system 1402.

The power supply device 1401 can comprise at least two power supplyunits which are connected with each other in parallel. Each of the powersupply units can be electrically connected with one control circuit topower the flight control system 1402.

The flight control system 1402 can be configure to detect whether the atleast two power supply units of the power supply device fail, andperform a failure handling process to reduce an output power based uponthe failure handling process if the at least two power supply units ofthe power supply device fail.

In some embodiments of the disclosure, the flight control system 1402can determine the power supply device 1401 fails if receiving a failuresignal from the power supply device 1401.

In some embodiments of the disclosure, the flight control system 1402can detect whether a communication connection between the flight controlsystem and the control circuit corresponding to at least one powersupply unit of the power supply device 1401 is disconnected, anddetermine the power supply device 1401 fails if the communicationconnection is disconnected.

In some embodiments of the disclosure, the flight control system 1402can detect whether a variation in an electric parameter outputted fromthe power supply device 1401 exceeds a preset threshold, and determinethe power supply device 1401 fails if the variation exceeds the presetthreshold.

In some embodiments of the disclosure, the flight control system 1402can perform a return flight process if the power supply device 1401fails.

In some embodiments of the disclosure, the flight control system 1402can perform a direct landing process if the power supply device 1401fails.

In some embodiments of the disclosure, the power supply device 1401 canbe a battery, and the power supply unit can be a cell unit.

Consistent with the disclosure, a failure of the first cell unit and/orthe second cell unit can be detected. The first cell unit can bedirected to terminate discharging or charging if the first cell unitfails. The second cell unit can be directed to terminate discharging orcharging if the second cell unit fails. The first cell unit and thesecond cell unit can each be a battery. If any cell unit in the batteryfails, a control circuit corresponding to the failed cell unit candisconnect an electrical connection between the failed cell unit and anexternal device. Therefore, a safety of the failed cell unit can beassured. Meanwhile, a cell unit that does not fail can continue a normaloperation, and thus a normal operation of the unmanned aerial vehiclecan be performed while a safety of the battery is assured. As comparedwith the conventional technologies, the technical solutions of presentdisclosure can improve a safety of the unmanned aerial vehicle withoutadversely affecting a payload capacity of the unmanned aerial vehicle.

The terms “or/as well as” and “and/or” used in the specification, theclaims, and the foregoing figures of the disclosure have the samemeaning. The terms “first,” “second,” and the like in the specification,the claims, and the foregoing figures of the disclosure are used todistinguishing similar objects, rather than describing a specificsequence or precedence order. It will be understood terms used thereforemay interchange where appropriate, so that the embodiments describedherein can be implemented in other order than the content depicted ordescribed herein. In addition, the terms “comprises,” “includes,” “has,”and their variants are intended to cover non-exclusive inclusion, forexample, processes, methods, systems, products, or devices including aseries of steps or modules are not limited to those steps or modulesenumerated, but may include other steps or modules that are notenumerated or that are intrinsic to these processes, methods, productsor devices. The division of modules as mentioned in this disclosure ismerely logical division, and in real application there may exist furtherdivision methods, for example, multiple modules may be combined into orintegrated on another system. Some features may be ignored or be notperformed. In addition, the mutual coupling or direct coupling orcommunication connection as displayed or discussed may be indirectcoupling between modules through some interfaces, or communicationconnection may take an electrical or other similar form. This is notlimited in this disclosure. Moreover, modules or sub-modules illustratedas separate components may be physically separate, may be physicalmodules, or may not be distributed among multiple circuit modules. Theobjectives of the embodiments of the disclosure may be accomplished byselecting part of or all modules according to actual needs.

The foregoing disclosure is merely illustrative of the embodiments ofthe disclosure but not intended to limit the scope of the disclosure.Any equivalent modifications to a structure or process flow, which aremade without departing from the specification and the drawings of thedisclosure, and a direct or indirect application in other relevanttechnical fields, shall also fall into the scope of the disclosure.

What is claimed is:
 1. A method for managing an unmanned aerial vehicle(UAV), the UAV including a first cell unit and a second cell unitconnected in parallel, the method comprising: detecting, by a firstcontrol circuit, whether a failure occurs in the first cell unit;detecting, by a second control circuit, whether a failure occurs in thesecond cell unit; establishing a communication between the first controlcircuit and the second control circuit; and in response to detecting asignal indicating that a failure occurs in the first cell or the secondcell from the first control circuit or the second control circuit,reducing an output power of a propulsion device of the UAV.
 2. Themethod according to claim 1, further comprising: outputting a firstfailure signal, by the first control circuit, in response to a failureoccurring in the first cell unit; and outputting a second failuresignal, by the second control circuit, in response to a failureoccurring in the second cell unit.
 3. The method according to claim 2,further comprising: in response to a failure occurring in the first cellunit, transmitting the first failure signal to an external device of theUAV by the second control circuit; and in response to a failureoccurring in the second cell unit, transmitting the second failuresignal to the external device of the UAV by the first control circuit.4. The method according to claim 1, further comprising: in response to afailure occurring in the first cell unit, disconnecting a communicationconnection between the first control circuit and the external device;and in response to a failure occurring in the second cell unit,disconnecting a communication connection between the second controlcircuit and the external device
 5. The method according to claim 1,wherein: detecting that a failure occurs in the first cell unit includesone of: detecting that a current of the first cell unit exceeds acurrent threshold; detecting that a voltage of at least one cell of thefirst cell unit exceeds a first voltage threshold; detecting that avoltage of at least one cell of the first cell unit is below a secondvoltage threshold; and detecting that a temperature of at least one cellof the first cell unit is outside a preset temperature range; anddetecting that a failure occurs in the second cell unit includes one of:detecting that a current of the second cell unit exceeds a currentthreshold; detecting that a voltage of at least one cell of the secondcell unit exceeds a first voltage threshold; detecting that a voltage ofat least one cell of the second cell unit is below a second voltagethreshold; and detecting that a temperature of at least one cell of thesecond cell unit is outside a preset temperature range.
 6. The methodaccording to claim 1, further comprising: in response to a failureoccurring in the first cell unit, directing the first cell unit toterminate discharging or charging; and in response to a failureoccurring in the second cell unit, directing the second cell unit toterminate discharging or charging.
 7. The method according to claim 1,further comprising: generating an alarm in response to detecting asignal indicating that a failure occurs in the first cell or the secondcell.
 8. The method according to claim 7, wherein generating the alarmcomprises at least one of: generating an audible alarm; and generating avisual alarm.
 9. The method according to claim 1, further comprising: inresponse to detecting a signal indicating that a failure occurs in thefirst cell or the second cell, directing the UAV to perform a returnflight.
 10. The method according to claim 1, further comprising: inresponse to detecting a signal indicating that a failure occurs in thefirst cell or the second cell, directing the UAV to perform a directlanding.
 11. An unmanned aerial vehicle (UAV), comprising: a propulsiondevice configured to provide a propulsion; a processor; and a batteryconfigured to provide an electric power to the propulsion device, thebattery including: a first cell unit; a first control circuitelectrically connected with the first cell unit; a second cell unitconnected with the first cell unit in parallel; and a second controlcircuit electrically connected with the second cell unit and incommunication with the first control circuit; wherein: the first controlcircuit is configured to detect whether a failure occurs in the firstcell unit; the second control circuit is configured to detect whether afailure occurs in the second cell unit; the processor is configured to,in response to reduce an output power of the propulsion device of theUAV in response to receiving a signal indicating that a failure occursin the first cell or the second cell from the first control circuit orthe second control circuit,
 12. The UAV according to claim 11, wherein:the first control circuit is further configured to output a firstfailure signal in response to a failure occurring in the first cellunit; and the second control circuit is further configured to output asecond failure signal in response to a failure occurring in the secondcell unit.
 13. The UAV according to claim 12, wherein: the secondcontrol circuit is further configured to transmit the first failuresignal to the processor in response to a failure occurring in the firstcell unit; and the first control circuit is further configured totransmit the second failure signal to the processor in response to afailure occurring in the second cell unit.
 14. The UAV according toclaim 11, wherein: the first control circuit is further configured todisconnect a communication connection between the first control circuitand the processor in response to a failure occurring in the first cellunit; and the second control circuit is further configured to disconnecta communication connection between the second control circuit and theprocessor in response to a failure occurring in the second cell unit.15. The UAV according to claim 11, wherein: detecting that a failureoccurs in the first cell unit includes one of: detecting that a currentof the first cell unit exceeds a current threshold; detecting that avoltage of at least one cell of the first cell unit exceeds a firstvoltage threshold; detecting that a voltage of at least one cell of thefirst cell unit is below a second voltage threshold; and detecting thata temperature of at least one cell of the first cell unit is outside apreset temperature range; and detecting that a failure occurs in thesecond cell unit includes one of: detecting that a current of the secondcell unit exceeds a current threshold; detecting that a voltage of atleast one cell of the second cell unit exceeds a first voltagethreshold; detecting that a voltage of at least one cell of the secondcell unit is below a second voltage threshold; and detecting that atemperature of at least one cell of the second cell unit is outside apreset temperature range.
 16. The UAV according to claim 11, furthercomprising: the first control circuit is further configured to directthe first cell unit to terminate discharging or charging the in responseto a failure occurring in the first cell unit; and the second controlcircuit is further configured to direct the second cell unit toterminate discharging or charging the in response to a failure occurringin the second cell unit.
 17. The UAV according to claim 11, wherein theprocessor is further configured to: generate an alarm in response todetecting a signal indicating that a failure occurs in the first cell orthe second cell.
 18. The UAV according to claim 17, wherein generatingthe alarm comprises at least one of: generating an audible alarm; andgenerating a visual alarm.
 19. The UAV according to claim 11, whereinthe processor is further configured to: direct the UAV to perform areturn flight in response to detecting a signal indicating that afailure occurs in the first cell or the second cell.
 20. The UAVaccording to claim 11, wherein the processor is further configured to:direct the UAV to perform a direct landing in response to detecting asignal indicating that a failure occurs in the first cell or the secondcell.